BOBJ 4 - Webi from Bex Query Best practice

Hi Experts,

We are trying to create Webi Reports using BOBJ 4 directly connecting to Bex Query but what is confusing me about the best practice regarding the same.

We are planning to completely build the Bex Report according to our requirement and do a 1:1 mapping to Webi. But I am not sure what will be ther rework effort if later the Bex query is changing then how much effort will be required to reflect the same in WEBI reports.

• All the new changes in the Bex query will automatically reflect in Webi Report (On right hand panel where we build the report by dragging the query elements from left panel of the tool)
• All the new changes in BEX query will reflect in left hand side of the panel . We need to remove that element from right hand panel 1st and then re-enter the element to reflect the change in Webi query.
• We need to rebuild the report completely.

what is the best practice with respect to the same? Should we ONLY build the webi once we are 100% done with the Bex report or we can start simultaneously building the same.

A quick reply will be appreciated.

Amit